Automatic circuit-closer.



No. 679,446. Patentad luly 30,190I.

a. A. WALL.

AUTOMATIC ClRCUlT CLOSER.

non filed. Dec. 7, 1900.

(lo Ilodel.)

ll liii' WI 5% m FIE. U I] i Prion,

PATENT GEORGE A. WALL, OF PROVIDENCE, RHODE ISLAND.

AUTOMATIC ClRCUlT- -CLOSER.

SPECIFICATION forming part of Letters Patent No. 679,446, dated July 30,1901.

Application filed December 7, 1900. Serial No. 39,099. (No model.)

matic circuit-closers or fire-alarms of this class by protecting it fromany chemical change which would tend to destroy its efficiency and whichmight be influenced or brought about by the character of the surroundingatmosphere. One of the chief difficulties in devices of this class comesfrom the corrosion of the solder, especially in manufacturing establishments where acids are employed, and from chemical changes otherwisearising which serve to harden the solder and prevent the prompt andtimely action of the several parts depending upon its ready fusion.

My invention further consists in certain details of construction andnovel combinations of parts, which will be more fully describedhereinafter and particularly pointed out in the claim.

In the accompanying drawings, Figure 1 is a side view of my device. Fig.2 is a bottom or under view of the same, and Fig. 3 is a verticalsection showing interior parts.

In the drawings, A is a plate or disk, which may be fastened to theceiling by screws passing through the flange B B. To this plate or diskthe thermostat O is secured.

D D are studs having oblique slots E E for the reception of theconducting-wires, the latter being held in place by set-screws ff.

G is an arm having a triangular slot extending into the interior of thethermostat. H is a flat tapering spring also extending into thethermostat and passing through the slot in the arm G. Both the arm andthe spring are connected, respectively, with the studs D D.

J is a very thin metallic air-tight cap which closes the thermostat.Upon the interior surface of the cap J and attached thereto by means ofsolder fusible at a low degree of heat is a hook K. The hook K may beprimarily attached to a disk L in order to provide a greatersoldering-surface and overcome its tendency to break out from the thinmetal.

To the hook K the deflected end of the spring H is secured, as shown inFig. 3.

It will now be readily perceived that in my device there is no solderexposed to the deleterious action of the surrounding atmosphere, butthat, on the contrary, it is all within the interior of the thermostat,made air-tight through the adjustment of the metallic cap J.

The thin metallic cap J may be plated with gold or any other metal orcovered with any material which will serve to prevent corrosion.

In the practical operation of my device the metallic cap J is made sothin that it will offer no appreciable obstruction to the action of theheat upon the solder, and the hook holding the deflected spring will bereleased in a manner well understood. Upon the release of the spring IIit will assume the position shown by the dottedline in Fig. 3, and willin so doing, owing to its tapering form and the triangular form of theslot in the arm G, secure a raking action between the respective edges,which is calculated to positively secure the closing of the circuit.

It is evident that slight changes might be made in the form andarrangement of the several parts described without departing from thespirit and scope of my invention, and hence I do not wish to limitmyself to the exact details of construction herein set forth; but,

Having fully described my invention, what I claim as new, and desire tosecure by Letters Patent, is

In an automatic circuit-closer, the combination with a shell having anopening at its center, and a cap fitted to close the opening, the innersurface of the cap having a fastening device held thereon by fusiblematerial, of an arm located within the shell, said arm provided with atriangular slot, and a flat tapering spring fastened at one end andconnected to the fastening device on the cap at the other end whereby tohold the cap in place, the free end of this spring located in positionto rake against an edge of the triangular slot and automatically closethe circuit when the fusible material on the cap is melted.

In testimony whereof I have signed my name to this specification in thepresence of two subscribing witnesses.

GEORGE A. WVALL.

Witnesses:

WALTER BJVINOENT, AUGUSTA P. FREDERICK.

